Apparatus for recovering soda



(No Model.)

1?. A. OLOUDMAN. APPARATUS FOR RECOVERING SODA. No. 418,273. Patented Dec. 31, 1889.

Was-$89 he 2 jwz 5 v w 'pulp-digesters.

generate steam.

UNITED STAT S T PATENT OFFICE.

FRANCIS A. CLOUDMAN, OF CUMBERLAND MILLS, MAINE, ASSIGNOR TO S. D. WVARREN & C0,, OF BOSTON, MASSACHUSETTS.

APPARATUS FOR RECOVERING SODA.

SPECIFICATION forming part of Letters Patent No. 418,273, dated December 31, 1889.

Application filed November 8, 1887. Serial No. 254,625. (No model.)

To all whom it may concern.-

Be it. known that I, FRANCIS A. CLOUDMAN, of Cumberland Mills, county of Cumberland,

and State of Maine, have invented an lmprovement in Apparatus for Recovering Soda, of which the following description, in connection with the accompanying drawings, is a specification,like letters and figures on the drawings representing like parts.

This invention relates to apparatus for recovering chemicals from solutions or mixed with other substances which are volatilizable or destructible by heat, and is especially adapted for recovering soda or equivalent chemical from the spent or waste liquor of The Waste or spent liquors referred to contain or hold in suspension substantially large quantities of carbona ceous mattersuch as resins, gums, &c.eX- tracted from the wood, straw, or other like material by the soda solution employed in the manufacture of pulp.

In accordance with my invention the spent liquor is preferably evaporated to a consistency of about 35 Baum in any suitable form of evaporating apparatus. The partially-evaporated liquid is next introduced into the combustiomchamber of a furnace of any desired construction through an atomizer, as will be described. The combustionchamber is preferably heated substantially to an incandescent heat, so that thecarbonaceous matter fed into the said chamber with the atomized spent liquor may be consumed.

The gases generated by the consumption of the carbonaceous matter referred to may be conducted to a condenser or wash-tower, where any soda carried off from the combustionchamber therebymay be recovered, the said gases preferably impinging upon a boiler located in the furnace to heat water therein to The soda thus freed from carbonaceous matter, which constitutes the chief impurity thereof, collects upon the floor of the combustion-chamber in a substantially fused liquid condition, and may be discharged therefrom through a suitable door or tap, preferably into wagons, by which it may be con:- veyed to the cooling-room.

The particular features in which my invention consists will be pointed out in the claims at the end of this specification.

Figure 1 shows in section and elevation a sufficient portion of an apparatus embodying my invention to enable it to be understood, the furnace being shown in section; and Fig. 2, a side elevation of the furnace shown in Fig. 1, looking toward the right.

The furnace A, of brick or other suitable material, is divided, as herein shown, by a substantially horizontal wall A into two chambers 12 I), connected by a passage 11?. The chamber 1), as herein shown, contains a boiler c of any desired or suitable style or type, in which steam may be generated, it being provided with the usual appurtenances, such as pressure-gage 20, watergage 21, safety-valve 22, &c.

The chamber 6, constituting the combustion-chamber of the furnace, has communicatin g with it, as shown, pipes at, (herein shown as three in number,) the said pipes constituting inlet-pipes for the said chamber. Each pipe at, as shown, has connected to it pipes to a a provided with suitable cocks a, the

pipe to being connected to asteam-supply, (it

may be the steam dome or space of the boiler 0,) the pipe a to an oil-supply, (not shown,) and the pipe 00' preferably to an evaporating- Cl1tlllb61,lll which the spent liquor is condensed to about 35 Baum. a a are connected together, as herein shown, to the pipes at, and constitute the atomizer of my apparatus, by which the spent liquor is injected into the chamber 1) in substantially a finely-divided state or spray; but I do not desire to limit my invention to this particular form of atomizer, as any other form of atomizer or arrangement of pipes by which the spent liquor is sprayed or finely divided may be used.

In operation the chamber 12 is first preferably heated substantially to the point of incandescence by oil supplied by the pipe a or in other suitable manner. The cook a of the pipe a is now opened to admit the partiallyevaporated spent liquor, which is atomized or injected into the chamber 1) by preferably superheated steam admitted into the. pipe a through the pipe at, the cockw in the pipe at being opened. The carbonaceous matter contained in the spent liquid is consumed in the chamber 1), and the gases thus generated pass into the chamber bi by passage b the said The pipes a IOO heated gases, after impinging upon the boiler c and generating steam therein, finding an exit through a pipe cl, connected to a condenser or Wash-tower e, the said gases in the condenser or Wash-tower e, as herein shown, being subjected to a spray of water issuing from a pipe f, connected to a suitable source of supply, and by which any soda carried over may be condensed or Washed out of the gases passed therethrough, the resulting liquid being carried away, as shown, by the pump D. The consumption of the carbonaceous matter maintains the temperature of the furnace 11 substantially at the point of incandescence, so that after the chamber Z) has been once heated the oil or other source of supply may be cut off; but, if desired, the oil may be admitted with the superheated steam through the pipe a to assist in the combustion of the carbonaceous matter. The soda injected into the chamber 1) strikes the walls thereof, which are preferably circular or concaved, so that the soda, in substantially a fused or liquid condition, may flow toward a duct or channel b leading to the outlet. door or tap d thus facilitating removal of.

the fused soda from the said chamber.

If it is desired to recover the soda in the form of black-ashthat is, with part of the carbon remaining unco1'1sumeda grate d rocked or made movable by a lever. (Z or in any suitable manner, may be located above the floor of the combustion-chamber and they soda collected upon the said grate and sifted therethrough, as desired, the said soda not being exposed to the heat sufficiently long to burn off all the carbon, or the temperature of the furnace being maintained somewhat below the incandescent point.

Instead of using superheated steam to inject the spent liquor into the combustion-:

pipe connected to said inlet-pipe,whereby the spent liquor mixed with oil is discharged into 1 the combustion-chamber in a finely-divided state and the carbonaceous matter contained in the said chemical liquor is consumed, substantially as described.

2. In a furnace for the recovery of chemicals, the combination, with a combustionchamber, of an atomizer consisting of a liql uid-inlet pipe connected to the supply of spent liquor to be recovered, and a steam-pipe connected thereto to discharge the spent liquor of pulp-digesters into said combustion-chamber in a finely-divided state, substantially as described.

3. In a furnace for the recovery of chemicals, a combustion-chamber and a boiler located in said furnace, combined with an atomizer consisting of a liquid-inlet pipe connected to the supply of spent liquor to be recovered, and a steam-pipe communicating with the said boiler and connected to the said liquid-pipe to discharge the spent liquor of pulp-digesters into said combustion-chamber in' a finely-divided state, the said boiler being heated by the combustion of carbonaceous matter contained in the said spent liquor, substantially as described.

4. In a furnace for the recovery of chemicals, a combustion-chamber and a boiler located in said furnace, combined with an atomizer consisting of a liquid-inlet pipe, and a steam-pipe communicating With the boiler and connected to the said inlet-pipe to discharge the spent liquor of pulp-digesters into said combustion-chamber in a finely-divided state, and With a condenser or Wash-tower connected to said furnace, whereby the gases are freed from the chemical, substantially as described.

5. In a furnace for the recovery of chemicals, a combustion-chamber, a rocking grate or floor therein, and a boiler located in said furnace, combined with an atomizer to discharge the spent liquor of pulp-digesters into said coinbustion-chamber, substantially as described.

6. In a furnace for the recovery of chemicals, the combination, with a combustionchamber having concaved or inclined walls, substantially as described, of an atomizer consisting of a liquid-inlet pipe and a steampipe, and an oil-pipe connected to the said liquid-pipe to discharge into the said chamber the spent liquorof pulp-digesters mixed with oil, as and for the purpose specified.

7. In a furnace for the recovery of chemicals, a combustion-chamber and an atomizer consisting of a liquid-inlet pipe connected to the supply of spent liquor to be recovered and a steam-pipe connected to said inletpipe to discharge the spent liquor of pulpdigesters into said combustion-chamber, combined with a condenser or Wash-tower connected to said furnace, whereby any chemical, as soda, carried off from the combustionchamber may be recovered, substantially as described.

8. In a furnace for the recovery of chemicals, the combination, with a combustionchamber, of a feed-pipe to supply the chemical, and an oil-pipe connected to the said 2 feed-pipe, substantially as described.

. In testimony whereof I have signed my name to this specification in the presence of two subscribin g witnesses.

FRANCIS A. OLOUDMAN. WVitn esses G. W. GREGORY, B. DEWAR.

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